Receiver spur for a firearm

ABSTRACT

A receiver spur adapted to be mounted behind the trigger and the trigger guard of a firearm such as the AR-15. The spur is configured to substantially conformingly abut the surface of the receiver immediately behind the trigger guard and is secured to the receiver.

CROSS-REFERENCE TO RELATED APPLICATIONS

The present application claims the benefit of priority to U.S. Provisional Patent Application Ser. No. 61/787,577, filed Mar. 15, 2013, entitled “RECEIVER SPUR ESPECIALLY ADAPTED FOR USE WITH AN AR-15 STYLE FIREARM”, the subject matter of which is hereby incorporated by reference.

FIELD OF THE INVENTION

The present invention relates to firearms, and more particularly to a receiver spur for use with firearms, especially for use with an AR-15 style firearm.

BACKGROUND OF THE INVENTION

The AR-15 firearm has been one of the most popular firearms in the United States, with both rifle and pistol configurations and versions for military use and civil use. The original AR-15 was designed and built by ArmaLite as an assault rifle for the United States armed forces. ArmaLite later sold its design to Colt, which made a few modifications to the design. The redesigned rifle was known as the M16 and became the United States military's standard service rifle during and since the Viet Nam War. The term AR-15 has been the Colt trademark for the civilian, semi-automatic versions of that design. Other manufacturers have made firearms having similar designs, but under different trademarks. Such similar designs include designs with different lengths and configurations of stocks and different barrel lengths. Further, due to the firearm's modular design, the upper portion of the receiver can be quickly and easily replaced with another upper receiver designed to accommodate different calibers of cartridges as well as associated barrels adapted to function with those different calibers of cartridges.

States within the United States have recently enacted laws that restrict the characteristics of so-called “assault weapons”, including semi-automatic firearms such as the AR-15 firearm. Notably, the state of California has banned the civilian possession of semi-automatic, centerfire rifles that have the capacity to accept a detachable magazine and possess a “pistol grip that protrudes conspicuously beneath the action of the weapon”, which is defined as meaning “a grip that allows for a pistol style grasp in which the web of the trigger hand (between the thumb and index finger) can be placed below the top exposed portion of the trigger while firing.”

The AR-15 style firearms heretofore manufactured are typically provided with pistol type grip that places the web of the trigger hand in a position that extends below the upper, exposed portion of the trigger.

The present invention was designed to provide a spur that may be substituted for or may replace a typical pistol grip employed with AR-15 style firearms, but which may be advantageously employed in other firearms as well. The spur is believed to avoid the aforementioned legal characteristic that results in such firearms being banned from civilian possession.

SUMMARY OF THE INVENTION

The present invention relates to a receiver spur adapted to be mounted behind the trigger and the trigger guard of a firearm such as the AR-15. The spur is configured to substantially conformingly abut the surface of the receiver immediately behind the trigger guard and is secured to the receiver.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will be described with reference to the accompanying drawings wherein:

FIG. 1 is a side view of a version of a conventional, prior art AR-15 firearm;

FIG. 2 depicts side views of two other versions of a conventional, prior art AR-15 firearm;

FIG. 3 is a perspective illustration of a broken view of a lower portion of a receiver of an AR-15 firearm with an exploded illustration of the hand grip typically attached via a machine screw to an ear or lug depending from the lower portion of a receiver;

FIG. 4 is a perspective illustration of a broken view the lower portion of a receiver of an AR-15 firearm;

FIG. 5 is a side, partial view of the conventional, AR-15 firearm with the pistol grip shown in FIG. 3 detached as well as the receiver spur of a preferred embodiment of the present invention mounted thereto;

FIG. 6 comprises several drawings depicting a receiver spur according to a preferred embodiment of the present invention;

FIG. 6A is a top view of the spur;

FIG. 6B is a cross-sectional view of the spur shown in FIG. 6A taken along the lines B-B;

FIG. 6C is a cross-sectional view of the spur shown in FIG. 6A taken along the lines C-C;

FIG. 6D is a perspective view of the spur shown in FIG. 6A;

FIG. 6E is a bottom view of the spur shown in FIG. 6A; and

FIG. 6F is another perspective view of the spur shown in FIG. 6A;

FIG. 7 is a side view of the AR-15 firearm with the receiver spur mounted thereon as shown in FIG. 5;

FIG. 8 is a perspective view of the AR-15 firearm with the receiver spur mounted thereon as shown in FIG. 5;

FIG. 9 is another perspective view of the AR-15 firearm with the receiver spur mounted thereon as shown in FIG. 5;

FIG. 10 is a side view of the AR-15 firearm with the receiver spur mounted thereon as shown in FIG. 5 illustrating how a human hand may be placed against the receiver spur with the index finger or forefinger of the hand operating the trigger; and

FIG. 11 is a reverse view of the AR-15 firearm with the receiver spur shown in FIG. 10, again showing how a human hand may be placed against the receiver spur with the index finger or forefinger of the hand operating the trigger.

DESCRIPTION OF A PREFERRED EMBODIMENT

The present invention will be described with reference to the accompanying drawings wherein like reference numerals refer to the same item.

There shown in FIG. 1 a conventional, prior art AR-15 firearm, which generally includes a centrally disposed frame, housing, or receiver 12, a barrel 14 extending forwardly from the upper portion of the receiver 12, a stock 16 extending rearwardly from the upper portion of the receiver 12, a trigger 18 depending from beneath the lower portion of the receiver 12 and movable in a rearward direction by means of a human finger to discharge a projectile from the barrel 14 of the firearm, a trigger guard 20 generally surrounding the trigger 18, which minimizes the potential for the trigger 18 being moved rearwardly through inadvertent contact with objects, a handle grip 22 connected to and depending from the underside of the lower portion of the receiver 12 in the region behind the trigger 18 and trigger guard 20, and a magazine opening or mouth 24 disposed on the underside of the lower portion of the receiver 12 immediately ahead of the trigger 18 and trigger guard 20. The magazine mouth 24 is adapted to selectively receive and secure a magazine box 26 that contains a plurality of cartridges designed to be fired in the receiver, thereby discharging a projectile from the cartridge and through the barrel 14 of the AR-15 firearm.

The operation of the AR-15 firearm is generally as follows. A person grasps the firearm with one hand around the handle grip 22 and the other hand around a hand guard or rail system 28 that surrounds the barrel 14. The person may then pull or squeeze the trigger 18 rearwardly with the index finger or forefinger of the hand grasping the hand grip 22. Squeezing of the trigger 18 causes cartridges within the firing chamber of the receiver 12 to be fired, thereby discharging a projectile or so-called bullet from the cartridge through the barrel 14 under high velocity. Cartridges within the magazine 26 are forced under spring bias serially into the firing chamber of the receiver 12, whereupon further squeezing of the trigger 18 causes such cartridges also to be fired and to discharge associated projectiles through the barrel 14 under high velocity. When the cartridges within the magazine 26 are depleted, the magazine 26 may be selectively detached from the lower portion of the receiver 12 and a new replacement magazine filled with cartridges may be inserted into the magazine mouth 24 and attached to the lower portion of the receiver 12. The AR-15 firearm may be discharged in a semi-automatic fashion, whereas the M-16 military version may be discharged in an automatic fashion, which means that the trigger 18 may be squeezed and held in a rearward position whereupon the cartridges in a magazine 16 will be fed into the firing chamber and fired serially, automatically in a quick succession.

FIG. 2 shows other versions of the AR-15 firearm in which the barrels, the stocks, the hand guards, carrying handles, and sights are different.

FIG. 3 illustrates how the handle grip 22 is typically secured to the receiver 12 in a conventional, prior art AR-15 firearm. An ear or lug 32 depends from the underside of the lower portion of the receiver 12, immediately behind the trigger 18 and the trigger guard 20. The lug 30 possesses a slanted or beveled surface generally inclined rearwardly and upwardly toward the stock 16. A reverse view of the lug 30 is best shown in FIG. 4. The upper portion of the handle grip 22 possesses a cavity adapted to accept the lug 30. The lug 30 possesses a threaded hole 32 therein which is adapted to receive a machine screw or bolt 34 which extends through the handle grip 22 and then into the threaded hole 32 to selectively secure the handle grip 22 to the lower portion of the receiver 12. A washer 36 may circumscribe the shaft of the machine screw or bolt 34 and be disposed against the head of the machine screw or bolt 34 in a well-known manner to inhibit the machine screw or bolt 34 from rotating and loosening from disposition within the threaded hole 32.

FIG. 5 depicts a receiver spur 50 in accordance with a preferred embodiment of the present invention. The receiver spur 50 is generally mounted to the lower rear portion of the receiver 12 immediately behind the trigger 18 and the trigger guard 20. FIG. 5 also depicts a detached handle grip 22 in a manner generally illustrating how the receiver spur 50 may replace the handle grip 22. As such, the receiver grip 50 may be retrofitted onto existing AR-15 firearms, or may be mounted to the receiver 12 as part of originally manufactured and distributed AR-15 firearms.

FIG. 6 illustrates in detail a receiver spur 50 in accordance with a preferred embodiment of the present invention. The receiver spur 50 includes a pair of spaced, substantially parallel, planar walls 52, 54 disposed on a front and upper portion thereof. The receiver spur 50 also includes an inwardly disposed beveled surface 56 extending between the walls 52, 54, as best shown in FIG. 6C. Together, the walls 52, 54 and the beveled surface 56 form an open cavity preferably adapted to conformingly receive and accept the lug 30 depending from the lower portion of the receiver 12. As such, the interior surfaces of the walls 52, 54 are preferably flat and parallel, and the beveled surface 56 is also preferably flat in a manner that substantially conforms with the configuration of the lug 30.

As best shown in FIGS. 6C, E, and F, the receiver spur 50 also includes a lower portion 58 preferably provided with a substantially centrally disposed recess 60. The recess 60 of the lower portion 58 may be partially defined by a beveled area that is co-planar with the beveled surface 56 extending between the walls 52, 54, as best shown in FIG. 6C.

The rear portion of the receiver spur 50 possesses a curved rear surface preferably curved in two orthogonal directions, as best shown in FIGS. 6C, D, and F. In one orthogonal direction (a line substantially orthogonal to the plane of movement of the trigger 18), the curve of the rear surface is substantially arcuate, as best shown in FIG. 6C. The receiver spur 50 also preferably includes a crook 62 that extends upwardly and rearwardly from the upper, rear portion of the receiver spur 50. The forward surface of the crook 62 is curved, preferably in substantially two orthogonal directions, and preferably possesses a configuration corresponding to the surface of the lower portion of the receiver 12 disposed immediately behind the lug 30, as is best shown in FIGS. 3 and 4. As such, the forward surface of the crook 62 preferably conformingly abuts the rounded surface of the lower portion of the receiver 12 located immediately behind the lug 30. The rear surface of the crook 62 is also curved, also preferably in two orthogonal directions, as best shown in FIGS. 6C, D, and F. The rear surface of the crook 62 is preferably substantially coextensive with and defines a continuous portion of the rear surface of the receiver spur 50. The distal end 64 of the crook 62 is preferably adapted to abut the front edge of a stock 16, as best shown in FIGS. 5 and 7-11.

The receiver spur 50 may be mounted to the lower portion of the receiver 12 by means of a machine screw or bolt 66 that is similar to the machine screw or bolt 34 shown in FIG. 3. A bore hole extends between the beveled area of the recess 60 to the beveled surface 56 extending between the walls 52, 54. The machine screw or bolt 66 extends through the bore hole and is oriented and adapted to extend into the threaded hole 32 of the lug 30 to selectively secure the receiver spur 50 to the lower portion of the receiver 12. Alternatively, the receiver spur 50 may be mounted to the lower portion of the receiver 12 by means of an adhesive placed within the cavity formed by the walls 52, 54 and the beveled surface 56 and preferably also against the front curved surface of the crook 62.

It will be appreciated from viewing FIGS. 6A, B, D, and F that the lower portion 58 of the receiver spur 50 is flared slightly outwardly. Such a configuration helps position a person's hand on the receiver spur 50 and inhibits the hand from sliding downwardly with respect to the receiver spur 50.

It will also be appreciated from reviewing FIGS. 5 and 7-10 that the receiver spur 30 provides a grip for the person intending to fire the AR-15 firearm, but that the receiver spur 50 is not a “pistol style grip”. Moreover, when the receiver spur 50 is mounted to the lower portion of the receiver 12, and a person grips the receiver spur 50 in a firing position with the index finger or forefinger extending to and around the trigger 18, as best shown in FIG. 10, the web of the trigger hand is not positioned below the uppermost exposed portion of the trigger 18.

The present invention contemplates that the receiver spur 50 may be fashioned of a single, unitary, integrally formed body. Such body may be fashioned of a variety of materials such as wood, rubber, plastic, and metal. In a preferred embodiment, the body is formed of nylon 6/6, which is impervious to oils and solvents normally used in connection with and around firearms. Alternatively, the receiver spur 50 may be fashioned of two or more pieces of the same or different materials secured together by adhesive, screws, bolts, snap-fit connectors, or other fastening members.

While various embodiments of the present invention have been described herein, it will be appreciated that the invention includes embodiments other than those specifically illustrated or described and that changes in the form and arrangement of parts and the specific manner of practicing the invention may be varied without departing from the nature or scope of the invention. Consequently, the invention may be practiced otherwise than is specifically described above. 

We claim:
 1. A receiver spur adapted to be mounted on the receiver of a firearm including a moveable trigger depending from the underside of the receiver for actuating the firing sequence of the firearm and a trigger guard partially surrounding the trigger and secured to the underside of the receiver, the receiver possessing a magazine mouth disposed on the underside of the receiver and ahead of the trigger and adapted to selectively receive and secure a detachable box magazine containing a plurality of cartridges, the receiver further possessing a lug depending from behind the trigger and the trigger guard and adapted to engage and secure a handle, the lug possessing a pair of opposing, parallel side walls and possessing a beveled lower surface extending between the side walls and the lug having a threaded hole therein, the threaded hole adapted to receive a threaded fastening member for securing the handle to the lug, the receiver spur comprising: a pair of spaced, substantially parallel, planar walls disposed on a front and upper portion thereof and a beveled surface disposed and extending between said walls, said walls and said beveled surface forming a cavity adapted and configured to substantially conformingly receive the lug therein; a lower portion; a rear portion possessing a rear surface curved smoothly substantially in two orthogonal directions; and a borehole extending therethrough from said lower portion to said beveled surface, said borehole adapted to receive a threaded fastening member therein that may selectively, threadably extend into the threaded hole so as to selectively secure the spur to the lug; the spur adapted to be disposed relative to the receiver such that the lug depends conformingly into the cavity thereof, such that the front portion thereof substantially abuts the trigger guard, such that a threaded fastening member may extend through the borehole and into the threaded hole to selectively secure the spur to the lug, and such that a person may grasp the spur with the curved rear surface abutting the webbed region of the person's hand between the thumb and the index finger and while in such an abutting relationship permit the distal end of the forefinger to extend to and around the trigger.
 2. The receiver spur according to claim 1 wherein said lower portion possesses a recessed region and wherein the borehole extends from the recessed region to the beveled surface.
 3. The receiver spur according to claim 1 wherein said receiver includes a rounded surface substantially immediately behind the lug and wherein the spur includes an upper, rear portion fashioned with an upwardly and rearwardly extending crook, with the forward surface of said crook configured to substantially conformingly abut said rounded surface and the rear surface of said crook being substantially coextensive with and defining a continuous portion of said curved rear surface.
 4. The receiver spur according to claim 3 wherein the firearm further includes a stock mounted to the rear of the receiver with a forward end of the stock disposed adjacent to the rear portion of the receiver and wherein the distal end of said crook substantially abuts the forward end of said stock when said spur is disposed relative to the receiver such that the lug depends substantially conformingly into the cavity thereof.
 5. The receiver spur according to claim 1 fashioned as a substantially unitary and integrally formed body.
 6. The receiver spur according to claim 4 fashioned as a substantially unitary and integrally formed body.
 7. The receiver spur according to claim 1 wherein, when the spur is disposed relative to said receiver such that the lug depends conformingly in the spur cavity, and when a person grasps the spur such that the webbed region of the person's hand between the thumb and the index finger and such that the distal end of the index finger extends to and around the trigger, then the webbed region will not be conspicuously lower than the highest portion of the trigger depending from the underside of the receiver.
 8. The receiver spur according to claim 6 wherein, when the spur is disposed relative to said receiver such that the lug depends conformingly in the body cavity, and when a person grasps the spur such that the webbed region of the person's hand between the thumb and the index finger and such that the distal end of the index finger extends to and around the trigger, then the webbed region will not be conspicuously lower than the highest portion of the trigger depending from the underside of the receiver.
 9. A receiver spur adapted to be mounted on the receiver of a firearm including a moveable trigger depending from the underside of the receiver for actuating the firing sequence of the firearm and a trigger guard partially surrounding the trigger and secured to the underside of the receiver, the receiver possessing a magazine mouth disposed on the underside of the receiver and ahead of the trigger and adapted to selectively receive and secure a detachable box magazine containing a plurality of cartridges, the receiver further possessing a lug depending from behind the trigger and the trigger guard, the receiver spur consisting essentially of: a pair of spaced, opposing walls disposed on a front and upper portion thereof and an inwardly disposed surface extending between said walls, said walls and said inwardly disposed surface forming a cavity adapted and configured to substantially conformingly receive the lug therein; a lower portion; and a rear portion possessing a curved rear surface; the spur adapted to be disposed relative to the receiver such that the lug depends conformingly into the cavity thereof, such that the front portion thereof substantially abuts the trigger guard, and such that a person may grasp the spur with the curved rear surface abutting the webbed region of the person's hand between the thumb and the index finger and while in such an abutting relationship permit the distal end of the index finger to extend to and around the trigger.
 10. The receiver spur according to claim 9 wherein the lug possesses a threaded hole therein, the threaded hole adapted to receive a threaded fastening member, wherein said lower portion of the spur possesses a recessed region, and wherein a borehole extends through the spur from said recessed region to said inwardly disposed surface, said borehole adapted to receive a threaded fastening member therein that may selectively, threadably extend into the threaded hole so as to selectively secure the spur to the lug.
 11. The receiver spur according to claim 9 wherein said receiver includes a rounded surface substantially immediately behind the lug and wherein the spur includes an upper, rear portion fashioned with an upwardly and rearwardly extending crook, with the forward surface of said crook configured to substantially conformingly abut said rounded surface and the rear surface of said crook being substantially coextensive with and defining a continuous portion of said curved rear surface.
 12. The receiver spur according to claim 11 wherein the firearm further includes a stock mounted to the rear of the receiver with a forward end of the stock disposed adjacent to the rear portion of the receiver and wherein the distal end of said crook substantially abuts the forward end of said stock when the spur is disposed relative to the receiver such that the lug depends substantially conformingly into the cavity thereof.
 13. The receiver spur according to claim 9 fashioned as a substantially unitary and integrally formed body.
 14. The receiver spur according to claim 12 fashioned as a substantially unitary and integrally formed body.
 15. In a firearm having a lug protruding from a receiver behind a trigger moveable substantially in a plane and a trigger guard, the improvement comprising a receiver spur, wherein the receiver spur consists essentially of: a pair of spaced, opposing walls disposed on a front and upper portion thereof and an inwardly disposed surface extending between said walls, said walls and said inwardly disposed surface forming a cavity adapted and configured to receive the lug; a lower portion; and a rear portion possessing a smoothly curved rear surface that bends substantially accurately about a line substantially orthogonal to the plane of movement of the trigger; the spur adapted to be disposed relative to the receiver such that the lug depends into the cavity thereof, such that the front portion thereof substantially abuts the trigger guard, and such that a person may grasp the spur with the curved rear surface abutting the webbed region of the person's hand between the thumb and the index finger and while in such an abutting relationship permit the distal end of the forefinger to extend to and around the trigger.
 16. The improvement in the firearm according to claim 15 wherein said lower portion of the spur possesses a recessed region and wherein a borehole extends through the spur from said recessed region to said inwardly disposed surface, said borehole adapted to receive a threaded fastening member therein that may selectively, threadably extend into the lug so as to selectively secure the spur to the lug.
 17. The improvement in the firearm according to claim 15 wherein the spur includes an upper, rear portion fashioned with an upwardly and rearwardly extending crook and wherein the forward surface of said crook is configured to substantially conformingly abut the surface of the receiver behind the lug and wherein the rear surface of said crook is substantially co-extensive with and defining a continuous portion of said curved rear surface.
 18. The improvement in the firearm according to claim 15 wherein the spur is fashioned as a substantially unitary and integrally formed body.
 19. The improvement in the firearm according to claim 15 wherein said spur is secured to the receiver of the firearm by an adhesive.
 20. The improvement in the firearm according to claim 15 wherein the spur is secured to the receiver of the firearm by a threaded fastening member. 